Piston-packing.



M. J. QUINN. PISTON PACKING. APPLICATION FILED SEPT. s, 1907.

902,168. Patented 0011.27, 1908.

2 SHEETS-SHEET 1.

Fig.1.

(FL F g. 2. Witnesses. Inysntoz (#14414 QL OMAN H cw 6' 2% M. J. QUINN.

PISTON PACKING.

APPLICATION FILED SEPT. 3, 1907.

902, 1 68. Patented Oct. 27, 1908.

2 SHEETSSHEET 2.

WiUZCSStZS. DIV/(71(0)? fim I 7 (4. //M

UNITED STATES PATENT OFFICE.

MARTIN J. QUINN, or 'roaon'ro, oN'rARIifoAnam, assionoa TO GLUFF BROTHERS, OF

TORONTO, CANADA, A FIRM;

, rrsron-rncxmo.

Speciflcation of Letter! Patent:

' Patented Oct. 27, 1908.'

Application filed Qiaptemb'er 8, 1907. Serial No. 391,058.

To all whom it may concern:-

Be it known that I, MARTIN JOSEPH QUINN, of the city of Toronto, in the county of York and Province of Ontario, Canada, have made newand useful Improvements in Piston-Packings, and do hereby declare that the following IS a full, clear, and exact description of the same.

This invention relates to a packing means for pistons and the object of the invention is to arrange the packlng so that. the pressure in the cylinder will positively, cause it to engage the inner surface-of the cylinder in which the piston is moving. T

In carrying out the inventlon the peripheral surface of the piston is formed with a circumferential channel, and to the peripheralsurface of the piston above the circumferential channel is secured one edge of the packing, the other edge of thepacking-being free to move outwards. from the piston and engage with the inner surface of the c linder, and one channel orfa series of c annels communicating through the piston wlth the circumferential channel to provide for the flow of the pressure fluid to the;

latter, so that the pressure fluid will press the free ed e of the packing into engagement with t e inner surface of the cylinder.

For an understanding \of the invention reference is to be had to the following description and to. the accompanying drawings in which,:-

Figure 1, isa sectional view of a piston made in accordance with the present invention with the packing flat against its peripheral surface. Fig. 2, is a similar view .to Fig. 1, showing, inan exaggerated form, the free edge of the packing pressed out- Wards from the iston. Fig. 3, is a view of a modification o the construction shown in Fig. 1. Fig. 4, is a vertical section of the cylinder of a hot air engine showin the application of the invention to a evice 'of that character. I 4

Like characters of reference refer to like parts throughout the specification and drawmgs.

In the peripheral surface of the piston a is a circumferential channel '6, and extending through the piston a. from the pressure side thereof and communicating with the circumferential channel I) is one channeFor a series of channels 0. Secured tothe eripheral surface of the piston, beyond t 'at side of the circumferential channel 6 remote from the pressure side of the piston is the fixed edge d of the packing f. As shown in Figs. 1 and 2 of the drawings the channels 0 may be formed through the piston a or as shown in Fig. 3 they may be formed in the peripheral surface of the piston, in either case the pressure fluid can enter behind the packing f during the movement of the piston and press the packing againstthe inner surface of the cylinder.

The present invention is particularly designed for hot air engines, in which it is necessary to prevent leakage from the c linder throu h the space between the piston and cylin er. In engines of this class it is necessary to loosely fit the piston in the cylinder so that there will be no risk of the friction of the parts or the expansion of the metal interrupting the action of the engine, and so that rovision will be made for the admission 0 a limited volume of air into the cylinder through the space between the piston and the inner surface of the cylinder to prevent the formation of a vacuum in the latter, and it is necessary in such cases to provide the piston with a packing so ar-' the piston a and arran ing them to extend to the circumferential c annl from the side of the piston a opposed to the action ofthe' pressure fluid so that the latter can pass through them to the circumferential channel 6 and press against the back of the packing f to increase the pressure against the inner surface of the c linder so that a' perfectly tight contact wil be established therewith. It is possible to employ the same style of packing for pump and other purposes, and

for that reason it is not desired to confine the use of the invention to any particular pur ose.

avin thus fully described my invention, what I cfaim as new and desire to secure by Letters Patent is z 1. A piston having an. unoccupied peripheral channel communicating, with the pressure side of the piston, and a packing secured at one edge to the piston to overhang said channel, and having its other edge free to be pressed outwards from the piston by the pressure fluid within the said channel.

2. A piston having. an unoccupied circumferential channel in its. peripheral surface, a duct in the piston leading from the circumferential channel'to the pressure side of the piston and a packing secured at one edge to the piston to overhang the circumferential channel, and having its other'edge free to be pressed outwards from the piston by the pressure fluid entering the circumferential channelthrough the said duct..

3. A piston having an unoccupied circumferential channel in its peripheral surface, a series of ducts formed through the piston from the pressure side thereof and communieating with the circumferential channel, a packing secured-at one edge to the piston to overhang the circumferential channel, and having its-other edge free to be pressed out Ward from the piston by the pressure fluid entering the circumferential channel through the said ducts.

Toronto, August 16th A. D. 1907.

' MARTIN J .QUINN. Signed in the presence of CHAS. H. RrcHEs, OLIVE A. BATEMAN. 

